---
id: 656877f71bba2b97acedf9af
title: الخطوة 3
challengeType: 20
dashedName: step-3
---

# --description--

Python comes with built-in classes that can help us with string manipulation. One of them is the `str` class. It has a method called `maketrans` that can help us create a translation table. This table can be used to replace characters in a string:

```python
str.maketrans({'t': 'c', 'l': 'b'})
```

The above, when called on a string, will replace all `t` characters with `c` and all `l` characters with `b`.

Create a variable called `card_translation` and assign it a translation table to replace all `-` and `` characters with an empty string.

# --hints--

You should create a `card_translation` variable within `main`.

```js
({
    test: () => {
        const transformedCode = code.replace(/\r/g, "");
        const main = __helpers.python.getDef("\n" + transformedCode, "main");
        const { function_body } = main;

        assert.match(function_body, / +card_translation\s*=/);
    }
})
```

You should assign `card_translation` a value of `str.maketrans({'-': '', ' ': ''})`.

```js
({
    test: () => {
        const transformedCode = code.replace(/\r/g, "");
        const main = __helpers.python.getDef("\n" + transformedCode, "main");
        const { function_body } = main;

        const allowedMatches = [
            / +card_translation\s*=\s*str\.maketrans\(\s*\{\s*('|")-\1\s*:\s*('|")\2\s*,\s*('|") \3\s*:\s*('|")\4\s*\}\s*\)/,
            / +card_translation\s*=\s*str\.maketrans\(\s*\{\s*('|") \1\s*:\s*('|")\2\s*,\s*('|")-\3\s*:\s*('|")\4\s*\}\s*\)/,
        ];
        const anyMatch = allowedMatches.some((match) => match.test(function_body));
        assert.isTrue(anyMatch);
    }
})
```

# --seed--

## --seed-contents--

```py
--fcc-editable-region--
def main():
    card_number = '4111-1111-4555-1142'

--fcc-editable-region--
```
